Cho 4,48l hỗn hợp gồm C2H2 và C2H4 qua dung dịch Br2. Lượng Br2 đã phản ứng là 48g. Xác định % về thể tích mỗi khí trong hỗn hợp ban đầu
(Cảm ơn mn nha)
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Ta có: \(n_{Br_2}=\dfrac{48}{160}=0,3\left(mol\right)\)
PT: \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
____0,15___0,3 (mol)
\(\Rightarrow\left\{{}\begin{matrix}V_{C_2H_2}=0,15.22,4=3,36\left(l\right)\\V_{CH_4}=2,24\left(l\right)\end{matrix}\right.\)
Bạn tham khảo nhé!
PTHH: C2H4 + Br2 --> C2H4Br2
0,1<--0,1
=> \(\%V_{C_2H_4}=\dfrac{0,1.22,4}{22,4}=10\%\)
=> %VCH4 = 100% - 10% = 90%
PTHH: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Ta có: \(\left\{{}\begin{matrix}n_{hhkhí}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\n_{C_2H_4Br_2}=\dfrac{18,8}{188}=0,1\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow n_{C_2H_4}=n_{CH_4}=n_{Br_2}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}V_{CH_4}=V_{C_2H_4}=0,1\cdot22,4=2,24\left(l\right)\\m_{Br_2}=0,1\cdot160=16\left(g\right)\end{matrix}\right.\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
a, Ta có: \(n_{hhk}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
\(n_{C_2H_4Br_2}=\dfrac{18,8}{188}=0,1\left(mol\right)\)
Theo PT: \(n_{C_2H_4}=n_{C_2H_4Br_2}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,1}{0,2}.100\%=50\%\\\%V_{CH_4}=50\%\end{matrix}\right.\)
b, Theo PT: \(n_{Br_2}=n_{C_2H_4Br_2}=0,1\left(mol\right)\)
\(\Rightarrow m_{Br_2}=0,1.160=16\left(g\right)\)
Bạn tham khảo nhé!
\(n_{Br_2}=\dfrac{8}{160}=0.05\left(mol\right)\)
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
\(0.05......0.05\)
\(V_{C_2H_4}=0.05\cdot22.4=1.12\left(l\right)\)
\(V_{CH_4}=20-1.12=18.88\left(l\right)\left(mol\right)\)
\(\%V_{C_2H_4}=\dfrac{1.12}{20}\cdot100\%=5.6\%\)
\(\%V_{CH_4}=100-5.6=94.4\%\)
\(n_{hh}=\dfrac{4,48}{22,4}=0,2mol\)
\(n_{Br_2}=\dfrac{48}{160}=0,3mol\)
Gọi \(\left\{{}\begin{matrix}n_{C_2H_2}=x\\n_{C_2H_4}=y\end{matrix}\right.\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
x 2x ( mol )
\(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
y y ( mol )
Ta có:
\(\left\{{}\begin{matrix}x+y=0,2\\2x+y=0,3\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,1\\y=0,1\end{matrix}\right.\)
\(\rightarrow\left\{{}\begin{matrix}\%V_{C_2H_2}=\dfrac{0,1}{0,2}.100=50\%\\\%V_{C_2H_4}=100\%-50\%=50\%\end{matrix}\right.\)